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remove hot pixels


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Posted
  • Location: South East UK
  • Weather Preferences: Thunderstorms/squalls/hoar-frost/mist
  • Location: South East UK

Ive tried to remove green and white pixels that show up in a couple of places on my photos, noticed these after turning off noise reduction on my pentax K10D, i tried a clone and heal option in Faststone and it worked ok

What is a good, easy to use standalone pixel remover ?

thanks

Edited by Sprites
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Posted
  • Location: Kingdom of Fife: 56.2º N, 3.2º W
  • Location: Kingdom of Fife: 56.2º N, 3.2º W

Try dark frame subtraction:

http://en.wikipedia.org/wiki/Dark_frame

There are various programs capable of doing it including Photoshop. I used to use a freebie prog but have forgotten the name of it. Most Astronomical discussion boards will have items on how and when best to uses it.

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Posted
  • Location: N.Bedfordshire, E.Northamptonshire
  • Weather Preferences: Cool not cold, warm not hot. No strong Wind.
  • Location: N.Bedfordshire, E.Northamptonshire

Think there was a plug-able for GIMP but not able to recall the details for it (it is all free).

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Posted
  • Location: North York Moors
  • Location: North York Moors

Is there a google group for this camera?
The knowledge base is quite impressive as a rule.
With Canon SLRs you can do a software trick to map any stuck pixels and it remembers their location and blends them with adjacent ones or something.
There might be some tool available for your camera too.

Otherwise you could be stuck with cloning them out when they are intrusive, as a repair will probably cost more than it's worth. 

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Posted
  • Location: Dead Centre of the Vale of Clwyd
  • Weather Preferences: Cold Sancerre.
  • Location: Dead Centre of the Vale of Clwyd

Are these turning up in the same place on each photo regardless of exposure length, or are they related to heat build-up (i.e. when using a long exposure)? The fix will be different for stuck pixels and hot pixels. For stuck pixels the K10D does not have an on-board pixel mapping routine, so you would need to take it to a dealer who could do it. Hot pixels are less of an impact, but harder to avoid (try a lower ISO setting). Hope this helps.

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Posted
  • Location: South East UK
  • Weather Preferences: Thunderstorms/squalls/hoar-frost/mist
  • Location: South East UK

Thanks for the tips,

the pixels appear in the same area so it must be "stuck" pixels.

One is a small white cross shape, as ive only found two that show up, i think the clone option is easiest, once ive converted a file to jpg..

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Posted
  • Location: Dead Centre of the Vale of Clwyd
  • Weather Preferences: Cold Sancerre.
  • Location: Dead Centre of the Vale of Clwyd

Ring a decent camera shop and get a price for remapping the CCD, may be less than you think.

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